Mark James Walker, FNP-C
Family Nurse Practitioner · Boston, MA
Mark James Walker, FNP-C is a family nurse practitioner with a practice address in Boston, Massachusetts, and NPI 1003330028, issued on Aug 1, 2017. Check the license (Massachusetts RN279876, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark James Walker
- Credential
- FNP-C
- Primary taxonomy
- Family Nurse Practitioner 363LF0000X
- License number
- RN279876 MA
Self-reported in NPPES; status is on the state search - Practice location
- 75 Francis St, Boston, MA 02115
- Phone
- (617) 732-5000
- Enumerated
- Aug 1, 2017
- Record last updated
- Jul 25, 2023
- Medicare enrollment
- Enrolled (PECOS I20171127001825); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family nurse practitioner records → All 4,724 in Massachusetts → Look up another NPI →
Also registered at 75 Francis St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark James Walker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license RN279876Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
51% fewer Medicare Part D claims than the average family nurse practitioner in 2024
638 Medicare Part D claims for 183 beneficiaries, against an average of 1,305 among the 140,557 providers of this specialty who prescribed in Part D.
Most prescribed
- Metoprolol Succinate106 claims
- Furosemide64 claims
- Eliquis56 claims
- Jardiance53 claims
- Atorvastatin Calcium46 claims
- Losartan Potassium26 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Brigham And Womens Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark James Walker among 4,724 family nurse practitioner records in Massachusetts
Mark James Walker, FNP-C is one of 4,724 family nurse practitioner records with a practice address in Massachusetts. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 44% of them.
- NPI issued2017 · 44% of these records are older, 51% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2017 · median 2019 among the 2,704 with a school on file
- Record last updated2023 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LF0000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
938 family nurse practitioner records list a practice address in Boston
They are 938 of the 41,865 NPPES records with a practice address in Boston, and 4,724 family nurse practitioner records in Massachusetts.
All 4,724 in Massachusetts → Every provider in Boston → Family Nurse Practitioner nationwide →
The 8 family nurse practitioner records with the nearest ZIP codes
- Stephanie Ahmed, N.P.Boston, MA 021151952493447
- Melissa Cochran, RN, MS, NPBoston, MA 021151578518858
- Tracey Costantino, NPBoston, MA 021151295779890
- Virginia Dalton, APRN BCBoston, MA 021151598703092
- Marina Donahue, N.P.Boston, MA 021151922161801
- Sherry Iuliano, NPBoston, MA 021151013065135
- Anne Kelly, NPBoston, MA 021151558303412
- Theresa Kennedy, FNPBoston, MA 021151316016892
Common questions
What is Mark James Walker, FNP-C's NPI number?
Mark James Walker, FNP-C's National Provider Identifier (NPI) is 1003330028, issued on Aug 1, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Mark James Walker, FNP-C located?
The NPPES record lists a practice address at 75 Francis St, Boston, MA, 02115. Phone: (617) 732-5000. Providers update this record themselves, so call before visiting.
How can I verify Mark James Walker, FNP-C's license?
NPPES lists Massachusetts license number RN279876, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Mark James Walker, FNP-C prescribe under Medicare Part D?
In 2024, Mark James Walker, FNP-C had 638 Medicare Part D claims for 183 beneficiaries; the average among family nurse practitioner prescribers was 1,305. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.